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Generation of entangled states by a linear coupling coupler pumped in two modes induced by broadband laser


Luong Thi Tu Oanh, Doan Quoc Khoa*, Chu Van Lanh, Hoang Minh Dong, Nguyen Thi Dung, Nguyen Thi Thao, Ngo Xuan Cuong

Source title: 
Optik, 208: 164028, 2020 (ISI)
Academic year of acceptance: 

We research on a Kerr nonlinear coupler comprising two nonlinear oscillations linearly couple with each other. This coupler is pumped by external classical fields, which are supposed to be decomposed into two parts: a coherent part and a randomly fluctuating chaotic component (white noise). We can see that the quantum evolution of the pumped couplers is closed in a Hilbert space of two-qubit spanned by single-photon and vacuum states only. Hence, the pumped couplers can treat as a system of two-qubit. Analysis of time evolution of the quantum entanglement shows that maximally entangled states can be generated in the system and compare these results with that obtained previously by other authors